/Engine/Source/Editor/UnrealEd/Public/EditorViewportClient.h
virtual bool Internal_InputAxis ( [FViewport](API\Runtime\Engine\FViewport) * Viewport, [FInputDeviceId](API\Runtime\Core\Misc\FInputDeviceId) DeviceID, [FKey](API\Runtime\InputCore\FKey) Key, float Delta, float DeltaTime, int32 NumSamples, bool bGamepad )